A Northwest Airlines flight made an emergency landing at Tokyo's main airport Tuesday after a burning smell was detected inside the cabin, officials said.
No injuries were reported, and police said no crime was suspected.
NW Flight 19, carrying 403 passengers and crew members, landed safely at Narita International Airport about half an hour after taking off from the airport for the Philippine capital of Manila, according to airport police and airline officials.
Airport police spokesman Hitoshi Yanagida said the pilot requested an emergency landing because of a possible fire inside the cabin after crew members reported the smell of something burning near the lavatories.
However, investigators who boarded the Boeing 747-400 found no trace of fire or smoke, Yanagida said.
The cause of the odor was under investigation, he said.
Airport spokesman Masaru Motoyama initially reported there was smoke inside the cabin.
Airline spokeswoman Hiroko Tanaka said all passengers would fly to Manila on another plane later Tuesday.